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US4982037A - Process for selectively alkylating biphenyl - Google Patents

Process for selectively alkylating biphenyl Download PDF

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US4982037A
US4982037A US07/426,500 US42650089A US4982037A US 4982037 A US4982037 A US 4982037A US 42650089 A US42650089 A US 42650089A US 4982037 A US4982037 A US 4982037A
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biphenyl
catalyst
reaction
para
molar ratio
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Tadashi Nakamura
Shouichi Hoshi
Yoshio Okada
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Kureha Corp
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Kureha Corp
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    • C—CHEMISTRY; METALLURGY
    • C07—ORGANIC CHEMISTRY
    • C07C—ACYCLIC OR CARBOCYCLIC COMPOUNDS
    • C07C2/00—Preparation of hydrocarbons from hydrocarbons containing a smaller number of carbon atoms
    • C07C2/54—Preparation of hydrocarbons from hydrocarbons containing a smaller number of carbon atoms by addition of unsaturated hydrocarbons to saturated hydrocarbons or to hydrocarbons containing a six-membered aromatic ring with no unsaturation outside the aromatic ring
    • C07C2/64—Addition to a carbon atom of a six-membered aromatic ring
    • C07C2/66—Catalytic processes
    • C—CHEMISTRY; METALLURGY
    • C07—ORGANIC CHEMISTRY
    • C07C—ACYCLIC OR CARBOCYCLIC COMPOUNDS
    • C07C2529/00—Catalysts comprising molecular sieves
    • C07C2529/04—Catalysts comprising molecular sieves having base-exchange properties, e.g. crystalline zeolites, pillared clays
    • C07C2529/06—Crystalline aluminosilicate zeolites; Isomorphous compounds thereof
    • C07C2529/18—Crystalline aluminosilicate zeolites; Isomorphous compounds thereof of the mordenite type
    • C—CHEMISTRY; METALLURGY
    • C07—ORGANIC CHEMISTRY
    • C07C—ACYCLIC OR CARBOCYCLIC COMPOUNDS
    • C07C2529/00—Catalysts comprising molecular sieves
    • C07C2529/04—Catalysts comprising molecular sieves having base-exchange properties, e.g. crystalline zeolites, pillared clays
    • C07C2529/06—Crystalline aluminosilicate zeolites; Isomorphous compounds thereof
    • C07C2529/40—Crystalline aluminosilicate zeolites; Isomorphous compounds thereof of the pentasil type, e.g. types ZSM-5, ZSM-8 or ZSM-11

Definitions

  • aromatic alkyl compounds are useful in various fields, and those having a substituent at a para-position are especially important.
  • the present invention relates to a process for producing with good selectivity a compound having an alkyl group at a para-position of biphenyl.
  • para-isopropylbiphenyl is useful as a solvent for a dye for pressure-sensitive recording paper
  • 4,4'-di-isopropylbiphenyl is convertible to 4,4'-biphenyl dicarboxylic acid or 4,4'-dihydroxybiphenyl by oxidation of side chains.
  • Japanese Patent Application Laid-Open (KOKAI) No. 56-156,222 (1981) discloses a method of producing an alkylbiphenyl which is rich in meta- and para-isomers by reacting biphenyl with an olefin while applying silica alumina or zeolite as a catalyst.
  • the ratio of para-isomer to meta-isomer in the alkylbiphenyl obtained by this method is not always high enough.
  • This reference does not disclose any process for producing a 4,4'-dialkyl compound.
  • a method of producing 4,4'-dialkylbiphenyl from an aromatic mercury compound using CuCl 2 , PdCl 2 or LiCl as a catalyst also discloses a process for producing p,p,-bicumyl (4,4'-di-isopropylbiphenyl).
  • a method using a mercury compound is unfavorable in view of influence on a human body.
  • a method of producing dialkylbiphenyl by reacting an aromatic halide with metallic sodium is described. This method, however, includes many side reactions such as dehalogenation etc., and the yield of the aimed product is rather low.
  • the use of metallic sodium cannot be an industrial method.
  • Biphenyl derivatives having a substituent at a para-position includes not only p-phenylphenol, 4,4'-dihydroxybiphenyl, which are already under commercial production, but also many useful derivatives such as p-isopropylbiphenyl, p-isopropenylbiphenyl and 4,4'-biphenyl dicarboxylic acid.
  • processes for producing these derivatives have not reached a sufficient level, and development of an economical process has been wanted earnestly.
  • the object of the present invention is to provide a process for producing, with good selectivity, a biphenyl derivative having an alkyl group at a para-position.
  • the present invention provides an alkylation process for selectively obtaining a para-isomer of an alkylbiphenyl in the alkylation of biphenyl with propylene or butene, characterized in that a zeolite having SiO 2 /Al 2 O 3 (molar ratio) of not less than 10, preferably 10 to 50 is used as a catalyst.
  • a zeolite having SiO 2 /Al 2 O 3 (molar ratio) of not less than 10, preferably 10 to 50 is used as a catalyst.
  • a preferable zeolite Mordenite type and ZSM-5 type zeolites can be exemplified. In both cases, those with the ions exchanged with H + are preferable because of the strong activity, but it is not necessary that the ions are completely exchanged by H + .
  • zeolites substituted largely, for instance, by NH 4 + or alkali metals are impractical because of their low activity.
  • silica alumina catalysts other than a zeolite there are some which have an excellent alkylation activity, but they have a low selectivity for para-isomers.
  • Y-, L- and A-type zeolites in other words, zeolites having the molar ratio of SiO 2 to Al 2 O 3 is less than 10, do not exhibit good selectivity for para-isomers, either. Since the isomer selectivity of these zeolites is poor, they are unsuitable as a catalyst for achieving the object of the present invention.
  • the molar ratio of SiO 2 to Al 2 O 3 of the zeolite catalyst for the present invention should not be less than 10, however, when it is too large, the reaction activity itself is apt to become lower, so that the ratio is preferably not to be more than 50.
  • the preferable molar ratio of an olefin to biphenyl in the raw materials is generally 0.5 to 2.2.
  • the molar ratio is appropriately determined depending upon whether the intended product is a monoalkylated compound, dialkylated compound or both of them. However, when the molar ratio of the olefin to biphenyl is less than 0.5, the amount of unreacted biphenyl becomes impractically large. On the other hand, if the molar ratio is 2.2 or more, an unnecessarily large amount of trialkylated compound is unfavorably produced.
  • the reaction temperature is 200° to 320° C., preferably 220° to 300° C.
  • the temperature is determined within this range depending on the activity of the catalyst and the degree of reaction (alkylation degree).
  • the alkylation degree is obtained from the following formula, wherein each component of the reaction mixture is expressed by molar fraction: ##EQU1##
  • reaction temperature is lower than 200° C.
  • reaction rate is impractically low
  • reaction temperature higher than 320° C. unfavorably brings about the production of heavy compound, which lead to deterioration of the catalyst and increases the by-products due to decomposition alkylation reactions.
  • the para-alkylbiphenyl produced by the process according to the present invention can be separated from other products and purified by conventional distillation and/or crystallization.
  • Other by-products for example, a meta-alkylbiphenyl is convertible to a para-alkylbiphenyl by a known trans-alkylation method or the like.
  • the para-alkylbiphenyl obtained, which is useful by itself, can be converted to another useful para-substituted bipheny by oxidizing side chains.
  • the reaction was carried out at 200° C. for 5 hours in the same way as in Example 1 except that 60 g of TSZ-640 HOA was used as the catalyst.
  • the propylation reaction was carried out at 230° C. for 15 hours in the same way as in Example 1 except that 30 g of TSZ-600 HOA (Mordenite type zeolite produced by Toyo Soda Co., Ltd., molar ratio of SiO 2 / to Al 2 O 3 is 10.2) was used as the catalyst.
  • TSZ-600 HOA Mordenite type zeolite produced by Toyo Soda Co., Ltd., molar ratio of SiO 2 / to Al 2 O 3 is 10.2
  • the alkyl biphenyls were analyzed by gas chromatography.
  • the operating conditions were as follows:
  • the selectivity for the para-isomer was calculated with the following formula by using the analyzed values of the reaction mixture (containing unreacted biphenyl): ##EQU2## wherein MIPB represents monoisopropylbiphenyl, and DIPB di-isopropylbiphenyl.
  • the propylation reaction was carried out at 240° C. for 2 hours in the same way as in Example 1 except that 60 g of silica alumina X-630 HN (produced by Nikki Chemical Co., Ltd., containing 27% of Al 2 O 3 ) was used as the catalyst.
  • the propylation reaction was carried out at 200° C. for 2 hours in the same way as in Example 1 except that 30 g of Y-type zeolite TSZ-330 HUA (produced by Toyo Soda Co., Ltd., molar ratio of SiO 2 / to Al 2 O 3 is 6) was used as the catalyst.
  • the propylation reaction was carried out at 200° C. for 1 hour in the same way as in Example 1 except that 30 g of L-type zeolite TSZ-500 HOA (produced by Toyo Soda Co., Ltd., molar ratio of SiO 2 to Al 2 O 3 is 6) was used as the catalyst.
  • Butylation reaction was carried out at 260° C. for 4 hours by using 2-butene in place of propylene and 30 g of TSZ-640 HOA as the catalyst in the same way as in Example 1.
  • the propylation reaction of biphenyl was carried out at 260° C. for 2 hours in the same way as in Example 1 except that 30 g of TSZ-821 (ZSM-5 type zeolite produced by Toyo Soda Co., Ltd., molar ratio of SiO 2 to Al 2 O 3 is 23.3; H type) was used as the catalyst.
  • the composition of the reaction product is as follows:

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  • Chemical & Material Sciences (AREA)
  • Organic Chemistry (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Organic Low-Molecular-Weight Compounds And Preparation Thereof (AREA)
  • Catalysts (AREA)
  • Low-Molecular Organic Synthesis Reactions Using Catalysts (AREA)

Abstract

Disclosed herein is a process for selectively synthesizing the para-isomer of alkylbiphenyl in the alkylation of biphenyl with propylene or butene, employing zeolite having a molar ratio of SiO2 to Al2 O3 of not less than 10, as a catalyst.

Description

This is a continuation of application Ser. No. 160,655, filed Feb. 26, 1988, now abandoned.
BACKGROUND OF THE INVENTION
Many aromatic alkyl compounds are useful in various fields, and those having a substituent at a para-position are especially important.
The present invention relates to a process for producing with good selectivity a compound having an alkyl group at a para-position of biphenyl.
Among the compounds produced by the process according to the present invention, para-isopropylbiphenyl is useful as a solvent for a dye for pressure-sensitive recording paper, and 4,4'-di-isopropylbiphenyl is convertible to 4,4'-biphenyl dicarboxylic acid or 4,4'-dihydroxybiphenyl by oxidation of side chains.
As a process for producing an alkylbiphenyl, (1) a method of reacting biphenyl with an olefin or an alkyl halide in the presence of a Friedel-Crafts catalyst such as aluminum chloride and (2) a method of reacting biphenyl with an olefin or an alcohol by using a solid acid catalyst such as silica alumina and zeolite are known. These methods, however, have a low selectivity for para-isomers.
Japanese Patent Application Laid-Open (KOKAI) No. 56-156,222 (1981) discloses a method of producing an alkylbiphenyl which is rich in meta- and para-isomers by reacting biphenyl with an olefin while applying silica alumina or zeolite as a catalyst. However, the ratio of para-isomer to meta-isomer in the alkylbiphenyl obtained by this method is not always high enough. This reference does not disclose any process for producing a 4,4'-dialkyl compound.
The following methods are known as a process for producing 4,4'-dialkylbiphenyl.
(1) Synthesis, (11) 822, (1978).
A method of reacting the iodonium salt of diaryl with CH3 MgS in the presence of NiCl2 as a catalyst. Since the raw material is difficult to obtain, this method cannot be industrially practicable.
(2) Japanese Patent Publication No. 47-10,705 (1972), U.S. Pat. No. 3,539,622.
A method of producing 4,4'-dialkylbiphenyl from an aromatic mercury compound using CuCl2, PdCl2 or LiCl as a catalyst. This reference also discloses a process for producing p,p,-bicumyl (4,4'-di-isopropylbiphenyl). However, a method using a mercury compound is unfavorable in view of influence on a human body.
(3) Azerb. Khim. Zh (1) 21-6 (1971).
A method of producing dialkylbiphenyl by reacting an aromatic halide with metallic sodium is described. This method, however, includes many side reactions such as dehalogenation etc., and the yield of the aimed product is rather low. The use of metallic sodium cannot be an industrial method.
On the other hand, many patents have been presented mainly by Mobil Oil for a process about selective alkylation of an aromatic group by using zeolite. Many of these patents are directed to producing a p-dialkylbenzene and no process to produce an alkylbiphenyl is found except one disclosed in the above Japanese Patent Application Laid-Open (KOKAI) No. 56-156,222 (1981).
Biphenyl derivatives having a substituent at a para-position includes not only p-phenylphenol, 4,4'-dihydroxybiphenyl, which are already under commercial production, but also many useful derivatives such as p-isopropylbiphenyl, p-isopropenylbiphenyl and 4,4'-biphenyl dicarboxylic acid. However, processes for producing these derivatives have not reached a sufficient level, and development of an economical process has been wanted earnestly.
As a result of the extensive studies performed by the present inventors in view of such situation, the present invention has been achieved.
SUMMARY OF THE INVENTION
The object of the present invention is to provide a process for producing, with good selectivity, a biphenyl derivative having an alkyl group at a para-position.
It is another object of the present invention to provide an alkylation process for selectively obtaining a para-isomer of an alkylbiphenyl from propylene or butene by applying, as a catalyst, zeolite in which the molar ratio of SiO2 to Al2 O3 is not less than 10.
It is still another object of the present invention to provide an alkylation process for selectively obtaining a para-isomer of an alkylbiphenyl by using a Mordenite type zeolite or a ZSM-5 type zeolite as a catalyst.
DETAILED DESCRIPTION OF THE INVENTION
The present invention provides an alkylation process for selectively obtaining a para-isomer of an alkylbiphenyl in the alkylation of biphenyl with propylene or butene, characterized in that a zeolite having SiO2 /Al2 O3 (molar ratio) of not less than 10, preferably 10 to 50 is used as a catalyst. As examples of a preferable zeolite, Mordenite type and ZSM-5 type zeolites can be exemplified. In both cases, those with the ions exchanged with H+ are preferable because of the strong activity, but it is not necessary that the ions are completely exchanged by H+. However, zeolites substituted largely, for instance, by NH4 + or alkali metals are impractical because of their low activity.
Among silica alumina catalysts other than a zeolite, there are some which have an excellent alkylation activity, but they have a low selectivity for para-isomers. Y-, L- and A-type zeolites, in other words, zeolites having the molar ratio of SiO2 to Al2 O3 is less than 10, do not exhibit good selectivity for para-isomers, either. Since the isomer selectivity of these zeolites is poor, they are unsuitable as a catalyst for achieving the object of the present invention.
The molar ratio of SiO2 to Al2 O3 of the zeolite catalyst for the present invention should not be less than 10, however, when it is too large, the reaction activity itself is apt to become lower, so that the ratio is preferably not to be more than 50.
The preferable molar ratio of an olefin to biphenyl in the raw materials is generally 0.5 to 2.2. The molar ratio is appropriately determined depending upon whether the intended product is a monoalkylated compound, dialkylated compound or both of them. However, when the molar ratio of the olefin to biphenyl is less than 0.5, the amount of unreacted biphenyl becomes impractically large. On the other hand, if the molar ratio is 2.2 or more, an unnecessarily large amount of trialkylated compound is unfavorably produced.
The reaction temperature is 200° to 320° C., preferably 220° to 300° C. The temperature is determined within this range depending on the activity of the catalyst and the degree of reaction (alkylation degree). The alkylation degree is obtained from the following formula, wherein each component of the reaction mixture is expressed by molar fraction: ##EQU1##
When the reaction temperature is lower than 200° C., the reaction rate is impractically low, while the reaction temperature higher than 320° C. unfavorably brings about the production of heavy compound, which lead to deterioration of the catalyst and increases the by-products due to decomposition alkylation reactions.
The para-alkylbiphenyl produced by the process according to the present invention can be separated from other products and purified by conventional distillation and/or crystallization. Other by-products, for example, a meta-alkylbiphenyl is convertible to a para-alkylbiphenyl by a known trans-alkylation method or the like. The para-alkylbiphenyl obtained, which is useful by itself, can be converted to another useful para-substituted bipheny by oxidizing side chains.
EXAMPLE 1
Into an 1 liter autoclave made of stainless steel, 616 g of biphenyl and 30 g of TSZ-640 HOA (Mordenite type zeolite produced by Toyo Soda Co., Ltd., molar ratio of SiO2 to Al2 O3 is 19.0) were charged, and the temperature was raised to about 250° C. Propylene was supplied under stirring while maintaining the pressure at 1 kg/cm2 G, thereby bringing the mixture into reaction at 250° C. for 5 hours.
The composition of reaction product and other data are shown in Table 1.
EXAMPLE 2
The reaction was carried out at 250° C. for 3 hours by using TSZ-640 HOA in the same way as in Example 1.
The results are shown in Table 1.
EXAMPLE 3
The reaction was carried out at 270° C. for 15 hours by using TSZ-640 HOA in the same way as in Example 1.
The results are shown in Table 1.
EXAMPLE 4
The reaction was carried out at 200° C. for 5 hours in the same way as in Example 1 except that 60 g of TSZ-640 HOA was used as the catalyst.
The results are shown in Table 1.
EXAMPLE 5
The propylation reaction was carried out at 230° C. for 15 hours in the same way as in Example 1 except that 30 g of TSZ-600 HOA (Mordenite type zeolite produced by Toyo Soda Co., Ltd., molar ratio of SiO2 / to Al2 O3 is 10.2) was used as the catalyst.
The results are shown in Table 1.
                                  TABLE 1                                 
__________________________________________________________________________
Propylation of Biphenyl in The Presence of Mordenite-type Zeolite as The  
Catalyst                                                                  
Ex-     Reaction                            Propyl-                       
                                                 Selectivity for          
am-     Temp.                                                             
             Composition of the Reaction Product (mol %)                  
                                            ation                         
                                                 p-derivative             
ple                                                                       
   Catalyst                                                               
        (°C.)                                                      
             Biphenyl                                                     
                  MIPB*.sup.(1)                                           
                       p-MIPB*.sup.(2)                                    
                             DIPB*.sup.(3)                                
                                  4,4' -DIPB*.sup.(4)                     
                                         *(5)                             
                                            degree                        
                                                 (%)                      
__________________________________________________________________________
1  *(6) 250  25.0 46.3 30.4  28.1 17.1   0.6                              
                                            1.04 63.3                     
2  *(6) 250  43.5 42.1 28.8  14.2  9.2   0.2                              
                                            0.71 67.3                     
3  *(6) 270   1.1 22.4 11.3  70.3 37.2   6.2                              
                                            1.82 49.0                     
4  *(6) 200  27.6 47.4 31.8  24.4 16.2   0.6                              
                                            0.98 66.3                     
5  *(7) 230  20.4 44.8 25.7  33.3 11.3   1.5                              
                                            1.15 46.5                     
__________________________________________________________________________
 *.sup.(1) MIPB means monoisopropylbiphenyl.                              
 *.sup.(2) pMIPB means paraisopropylbiphenyl in MIPB                      
 *.sup.(3) DIPB means diisopropylbiphenyl                                 
 *.sup.(4) 4,4DIPB means 4,4diiisopropylbiphenyl in DIPB                  
 *(5) Total mol % of biphenyls substituted with propyl groups of not less 
 than 3.                                                                  
 *(6) TSZ640HOA is used as the catalyst                                   
  *(7) TSZ600HOA is used as the catalyst
The alkyl biphenyls were analyzed by gas chromatography. The operating conditions were as follows:
______________________________________                                    
Column:           SUS Golay column                                        
                  (0.25 mmΦ × 45 m)                             
Temperature:      150° C.                                          
Carrier gas:      helium                                                  
Detector:         FID                                                     
______________________________________
The selectivity for the para-isomer was calculated with the following formula by using the analyzed values of the reaction mixture (containing unreacted biphenyl): ##EQU2## wherein MIPB represents monoisopropylbiphenyl, and DIPB di-isopropylbiphenyl.
COMPARATIVE EXAMPLE 1; REACTION USING A SILICA ALUMINA CATALYST
The propylation reaction was carried out at 240° C. for 2 hours in the same way as in Example 1 except that 60 g of silica alumina X-630 HN (produced by Nikki Chemical Co., Ltd., containing 27% of Al2 O3) was used as the catalyst.
The results are shown in Table 2.
COMPARATIVE EXAMPLE 2; REACTION USING A Y-TYPE ZEOLITE
The propylation reaction was carried out at 200° C. for 2 hours in the same way as in Example 1 except that 30 g of Y-type zeolite TSZ-330 HUA (produced by Toyo Soda Co., Ltd., molar ratio of SiO2 / to Al2 O3 is 6) was used as the catalyst.
The results are shown in Table 2.
COMPARATIVE EXAMPLE 3; REACTION USING AN L-TYPE ZEOLITE
The propylation reaction was carried out at 200° C. for 1 hour in the same way as in Example 1 except that 30 g of L-type zeolite TSZ-500 HOA (produced by Toyo Soda Co., Ltd., molar ratio of SiO2 to Al2 O3 is 6) was used as the catalyst.
The results are shown in Table 2.
                                  TABLE 2                                 
__________________________________________________________________________
Comparative Examples of Propylation of Biphenyl                           
        SiO.sub.2 /                                    Selectivity        
Com.    Al.sub.2 O.sub.3                                                  
            Reaction                               Propyl-                
                                                       for                
Ex. Cata-                                                                 
        (mol                                                              
            Temp.                                                         
                 Composition of the Reaction Product (mol                 
                                                   ation                  
                                                       p-derivative       
No. lyst                                                                  
        ratio)                                                            
            (°C.)                                                  
                 Biphenyl                                                 
                      MIPB*(1)                                            
                            p-MIPB*(2)                                    
                                   DIPB*(3)                               
                                         4,4'-DIPB*(4)                    
                                                *(5)                      
                                                   degree                 
                                                       (%)                
__________________________________________________________________________
1   *(6)                                                                  
        4.5 240  30.6 46.8  21.9   21.4  2.9    1.2                       
                                                   0.93                   
                                                       35.7               
2   *(7)                                                                  
        6   200  6.4  34.1  15.4   50.8  5.7    8.7                       
                                                   1.62                   
                                                       22.5               
3   *(8)                                                                  
        6   200  31.1 47.1  18.0   21.4  2.0    0.4                       
                                                   0.91                   
                                                       29.0               
__________________________________________________________________________
 *(1)MIPB means monoisopropylbiphenyl.                                    
 *(2)pMIPB means paraisopropylbiphenyl in MIPB.                           
 *(3)DIPB means diisopropylbiphenyl.                                      
 *(4)4,4DIPB means 4,4diisopropylbiphenyl in DIPB                         
 *(5) Total mol % of biphenyls substituted with propyl groups of not less 
 than 3.                                                                  
 *(6) SilicaAlumina                                                       
 *(7) Y type zeolite.                                                     
 *(8) L type zeolite.
EXAMPLE 6; BUTYLATION REACTION
Butylation reaction was carried out at 260° C. for 4 hours by using 2-butene in place of propylene and 30 g of TSZ-640 HOA as the catalyst in the same way as in Example 1.
The composition of the reaction product and other data are shown in Table 3.
EXAMPLE 7; BUTYLATION REACTION
The butylation reaction was carried for 6 hours in the same way as in Example 6 except for using 60 g of TSZ-640 HOA.
The composition of the reaction product and other date are shown in Table 3.
                                  TABLE 3                                 
__________________________________________________________________________
Butylation of Biphenyl in The Presence of Mordenite-Type Zeolite as The   
Catalyst                                                                  
                                              Selectivity for             
Example                                                                   
     Compostion of The Reaction Product (mol %)                           
                                        Butylation                        
                                              p-derivative                
No.  Biphenyl                                                             
          MSBB*(1)                                                        
                p-MSBB*(2)                                                
                       DSBB*(3)                                           
                             4,4'-DSBB*(4)                                
                                     *(5)                                 
                                        degree                            
                                              (%)                         
__________________________________________________________________________
6    49.4 41.1  34.2   9.5   7.9     0.0                                  
                                        0.60  83.2                        
7    23.0 51.7  39.1   24.9  18.4    0.4                                  
                                        1.03  74.7                        
__________________________________________________________________________
 *(1)MSBB means monosec-butylbiphenyl.                                    
 *(2)pMSBB means parasec-butylbiphenyl in MSBB.                           
 *(3)DSBB means disec-butylbiphenyl.                                      
 *(4)4,4DSBB means 4,4di-sec-butylbiphenyl in DSBB.                       
 *(5) Total mol % of biphenyl substituted with butyl group of not less tha
 3.
EXAMPLE 8
The propylation reaction of biphenyl was carried out at 260° C. for 2 hours in the same way as in Example 1 except that 30 g of TSZ-821 (ZSM-5 type zeolite produced by Toyo Soda Co., Ltd., molar ratio of SiO2 to Al2 O3 is 23.3; H type) was used as the catalyst. The composition of the reaction product is as follows:
______________________________________                                    
Component      Composition (mol %)                                        
______________________________________                                    
Biphenyl       53.7                                                       
Monoisopropyl- 31.5                                                       
biphenyl                                                                  
(p-monoisopropyl-                                                         
               (17.2)                                                     
biphenyl)                                                                 
Di-isopropyl-  12.8                                                       
biphenyl                                                                  
(4,4'-di-isopropyl                                                        
               (2.4)                                                      
biphenyl)                                                                 
Tri- or more   2.0                                                        
isopropyl                                                                 
biphenyl                                                                  
Propylation    0.63                                                       
degree                                                                    
Selectivity for                                                           
               42.3                                                       
para-isomer                                                               
______________________________________

Claims (3)

What is claimed is:
1. An alkylation process to obtain selectively para-isopropylbiphenyl or 4,4'-diisopropylbiphenyl in an alkylation of biphenyl with propylene comprising the step of using, as a catalyst, a Mordenite zeolite having a molar ratio of SiO2 to Al2 O3 of not less than 10.
2. The alkylation process according to claim 1, wherein a molar ratio of propylene and biphenyl is 0.5 to 2.2.
3. The alkylation process according to claim 1, wherein the reaction temperature of said alkylation is 200° to 320° C.
US07/426,500 1987-03-13 1989-10-23 Process for selectively alkylating biphenyl Expired - Lifetime US4982037A (en)

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JP62058348A JPH0764760B2 (en) 1987-03-13 1987-03-13 Paraphenyl selective alkylation process
JP62-58348 1987-03-13

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Cited By (8)

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EP0508835A3 (en) * 1991-04-12 1994-05-25 Nippon Oil Co Ltd Method of preparing alkylbiphenyls
US5900519A (en) * 1991-08-21 1999-05-04 Solutia Inc. Catalytic process for the selective alkylation of polycyclic aromatic compounds
US5488193A (en) * 1992-11-06 1996-01-30 Mobil Oil Corporation Process for reducing polynuclear aromatic mutagenicity by alkylation
US20040073074A1 (en) * 2002-08-30 2004-04-15 Shinichiro Yanagawa Method of continuous production of polyalkylbiphenyls
US7205445B2 (en) * 2002-08-30 2007-04-17 Nippon Petrochemicals, Co., Ltd. Method of continuous production of polyalkylbiphenyls
US20050137436A1 (en) * 2003-11-12 2005-06-23 General Electric Company Method of preparing 4,4'-diisopropylbiphenyl
US20050137437A1 (en) * 2003-11-12 2005-06-23 General Electric Company Continuous preparation of 4,4'-diisopropylbiphenyl
US11476485B1 (en) * 2018-05-31 2022-10-18 Triad National Security, Llc Polyaromatic electrolytes for alkaline membrane fuel cells

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EP0285280B1 (en) 1992-05-20
EP0285280A1 (en) 1988-10-05
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JPS63227529A (en) 1988-09-21
DE3871214D1 (en) 1992-06-25

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